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Flexible Polyurethane Foam Sealant (DK-720)

Flexible Polyurethane Foam Sealant (DK-720)

The Flexible Polyurethane Foam Sealant (DK-720) is a hydrophilic, single-component polyurethane foam sealant designed for effectively preventing fine cracks and leaks in concrete underground structures. This product reacts with water to form a soft and flexible structure, allowing it to adapt well to shrinkage and expansion. It is suitable for use in areas with leak widths ranging from 0.3 to 0.8mm.
Key Features

Excellent Elasticity: No breakage occurs in response to the shrinkage and expansion of structures.

Perfect Penetration: Its low viscosity enables it to thoroughly penetrate fine gaps, effectively blocking leaks.

Rapid Reactivity: Quickly reacts with water, allowing for efficient waterproofing work.

Strong Adhesion: Maintains a solid bond with the substrate, preventing delamination.

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Technical Information


 

Category

Flexible Polyurethane Foam Sealant Sealing (DK-720)

Content

Mix Ratio

Single-component

Appearance

Dark Brown

Specific Gravity

1.1 ± 1.15

Viscosity

300~500

Tensile Shear Adhesion Strength

8.3

Elongation (%)

72

Packaging Unit

20kg/10kg






Flexible Polyurethane Foam Sealant Application


  1. Leak Inspection:
    1. To accurately address the leakage issues in a structure, the inspection process involves:
      1. Extent of Leaks: Measuring the size and extent of cracks to assess the severity of the problem.
      2. Leakage Amount: Quantifying the amount of leakage to determine the necessity of waterproofing measures.
      3. Crack Angle: Assessing the direction and angle of cracks to choose the appropriate injection method.
      4. Crack Depth: Evaluating how deeply cracks penetrate into the structure.

  2. Drilling and Injection Port Installation:
    1. Based on the inspection results, drill holes at the identified cracks or gaps. Insert and securely fix metal injection ports into the drilled areas to prepare them for the injection process. These ports help ensure proper delivery of the expanding foam.

  3. Injection Process:
    1. When injecting the polyurethane foam, it reacts instantly with any moisture inside the cracks, expanding rapidly. This reaction forms a high-density foam that completely seals the cracks. The foam penetrates deeply into the cracks, providing effective waterproofing.

  4. Finalization:
    1. After the injection, check for any remaining leaks. If any leakage persists, inject additional polyurethane foam into the affected areas to ensure complete waterproofing. Finally, tidy up the work area and perform any necessary finishing touches to complete the job.

      For more details, please refer to the Technical Data Sheet (TDS) or the specifications.
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